<!--
 * @Author: your name
 * @Date: 2021-05-31 16:11:28
 * @LastEditTime: 2021-07-05 21:27:11
 * @LastEditors: Please set LastEditors
 * @Description: In User Settings Edit
 * @FilePath: \day7\03-tabbar\src\view\home\Home.vue
-->
<template>
    <div id="home" class="wrapper">
         <nav-bar class="home-nav"><div slot="center">购物街</div></nav-bar>
         <tab-control class="tab-control" :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl1" v-show="isTabFixed"></tab-control>
            <scroll class="content" 
            ref="scroll"
            :probe-type="3"
            :pull-up-load="true"
            @pullingUp="loadMore"
            @scroll="contentScroll">
            
                <home-swiper :banners="banners" @swiperImageLoad="swiperImageLoad"></home-swiper>
                <recommend-view :recommends="recommends"></recommend-view>
                <feature-view></feature-view>
                <tab-control class="tab-control" :titles="['流行','新款','精选']" @tabClick="tabClick" ref="tabControl2"></tab-control>
                <goods-list :goods="showGoods"></goods-list>
            </scroll>
            <back-top @click.native="backClick" v-show="isShowBackTop"></back-top>
            

    </div>
</template>

<script>
import NavBar from 'components/common/navbar/NavBar'
import TabControl from 'components/content/tabControl/TabControl'
import GoodsList from 'components/content/goods/GoodsList'
import Scroll from 'components/common/scroll/Scroll'
import{itemListenerMixin,backTopMixin} from 'common/mixin'
import HomeSwiper from './childComps/HomeSwiper'
import RecommendView from './childComps/RecommendView'
import FeatureView from './childComps/FeatureView'
import {getHomeMultidata,getHomeGoods} from 'network/home'
import {debounce} from "common/utils";

export default {
    name:'Home',
    components: {
         NavBar,
         TabControl,
         GoodsList,
         HomeSwiper,
         RecommendView,
         FeatureView,
         Scroll
       
    },
    mixins:[itemListenerMixin,backTopMixin],
    data(){
        return{
            banners: [],
            recommends:[],
            goods:{
            'pop':{page:0,list:[]},
            'new':{page:0,list:[]},
            'sell':{page:0,list:[]}
            },
            currentType:'pop',
            isShowBackTop:false,
            tabOffsetTop:0,
            isTabFixed:false,
            saveY:0,
           
        }
    },
    computed: {
        showGoods(){
            return this.goods[this.currentType].list
        }
    },
    destroyed () {
        console.log('home destroyed');
    },
    activated () {
        //console.log('activated');
        this.$refs.scroll.scrollTo(0,this.saveY,0)
    },
    deactivated () {
        //console.log('deactivated');
        //保存y值
        this.saveY=this.$refs.scroll.getScroll();
        //取消全局监听事件
        this.$bus.$off('itemImgLoad',this.itemImgListener);
    },
    created(){
        //请求多个数据
        this.getHomeMultidata()
        this.getHomeGoods('pop')
        this.getHomeGoods('new')
        this.getHomeGoods('sell')
    },
    mounted () {
        
        //console.log(this.$refs.tabControl.$el);
        //console.log(this.$refs.tabControl.$el.offsetTop);
         // 1.图片加载完成的事件监听
      const refresh = debounce(this.$refs.scroll.refresh, 50)
      this.$bus.$on('itemImageLoad', () => {
        refresh()
      })
    },
    methods: {
        //事件监听相关方法
        tabClick(index){
            switch(index){
                case 0:
                this.currentType='pop'
                break
                case 1:
                this.currentType='new'
                break
                case 2:
                this.currentType='sell'
                break
            }
             this.$refs.tabControl1.currentIndex=index;
             this.$refs.tabControl2.currentIndex=index;
        },
       

        swiperImageLoad(){
           this.tabOffsetTop=this.$refs.tabControl2.$el.offsetTop;
           //console.log(this.$refs.tabControl.$el.offsetTop)
           
        },
        contentScroll(position){
            this.isShowBackTop = (-position.y) > 1000
            //决定tabControl是否吸顶(position:fixed)
            this.isTabFixed=(-position.y)>this.tabOffsetTop
        },
        loadMore(){
            this.getHomeGoods(this.currentType);
        },
        //网络请求相关方法
        getHomeMultidata(){
            getHomeMultidata().then((res)=>{
            //console.log(res)
             this.banners =res.data.banner.list;
            this.recommends=res.data.recommend.list;
        })
        },
       getHomeGoods(type){
            const page=this.goods[type].page+1;
             getHomeGoods(type,page).then (( res)=>{
                //console.log(res)
                //把data中的数据塞到goods里 都是数据所以要加...对数组进行解析，一个个取出来push到goods里
                this.goods[type].list.push(...res.data.list)
                this.goods[type].page+=1;
                this.$refs.scroll.finishPullUp()

            })
        }
    }
}
</script>

<style scoped>
 #home {
    /*padding-top: 44px;*/
    height: 100vh;
    position: relative;
  
  }

  .home-nav {
    background-color: var(--color-tint);
    color: #fff;

    /* position: fixed;
    left: 0;
    right: 0;
    top: 0;
    z-index: 9; */
    
  }

  .tab-control {
    position: relative;
    z-index: 9;
  }

  .content {
    overflow: hidden;
    position: absolute;
    top: 44px;
    bottom: 49px;
    left: 0;
    right: 0;
  }

  /* .content {
    height: calc(100% - 93px);
    overflow: hidden; 
    margin-top: 49px;
  } */
</style>